Pronounced “hahj.” In Islam, a pilgrimage to Mecca in Saudi Arabia, the birthplace of the Prophet Muhammad. It is the fifth of the Five Pillars of Islam. Every Muslim who is physically capable and financially able is expected to make the hajj at least once. Hajj takes place during the 12th month of the Islamic year, and specific rites take place during a five-day period. Because Muslims follow a lunar calendar, the dates move each year. The festival of Eid al-Adha occurs at the end of hajj. A hajji is a person who has undertaken the pilgrimage. See Eid al-Adha.